Adjustable head for milling-machines



(No Model.)

A. SGHURGH. ADJUSTABLE HEAD POR MILLING MAGHINLS. Nmzas. Patented Aug.l 21, 188s,

n. rzrsns. mxwmmpm. ummm ad 'Artnr 1CE ALBERT soHUncH, or san ADJUSTABLE HEAD Fo FRANCISCO, CALIF()RNIA.

R MlLLiNG-MACHINES.

SPECIFICATION forming par@ or Letters Patent No. 283,658, dated August 21, less.

Application filed March 30, 1383. (No model.)

' do hereby decla-re that the following is a full,

clear, and exact description of my said invention, reference being had to the accompanying drawings.

My invention relates to a novel construe tion of head for millingmaehines.

It consists in mounting the head upon a swinging bearing in such manner that it can be turned up and iixed in any ppsition from horizontal to vertical, so that the spindle can be set to work in either of these two posi and carry out the saine, the said drawings being referred to by figures and letters as follows:

Figure l represents a front View of a millinginachine, of any common const-ru ction, having my improvements applied toit. Fig. 2 is a side elevation taken from the lefthand side of Fig. Fig. 8 is a view of the swinging head detached from the bed, and showing, also, the spindle turned into vertical position. Fig. it-is a detail view oi' the adjustable belt-controlling frame. Figs. 5 and G are detail Views, on a larger scale, oi' the device for moving and setting the head.

A represents the bed of a milling-machine; B the table, and C D the stock constituting the head1 The cutter, being placed in the end of the part C which is nearest the table B, will be brought to act horizontally against any article thereon when in position shown in Figs. 1 and 2, and vertical when in position shown in Fig. 3. Instead of iixing thehead directly to the To the slide E, at the rear end, I fix two stal tionary slotted arcs, F, one on each side of the stock D, and by means of a shaft, g', carried' through the rear part of the stock at the. bottom, and having studs at each end to fit the slots, I connect the head to these arcs, that thus forni guides and supports for the r'ear end of the stockf. The ends or stud portions that play in the slots have rollers or loose collars A bindingnut, G', on the end of one of the studs serves as a means for holding the rear end of the stock wherever it may be set, and a handle, G, on the opposite end of the shaft g, is provided as a means of rotating the shaft. A pinion, I, is fixed on this shaft at each side or the stock and on the inner side of the curved guides/F to engage with the curved 'racks 7L on the side of the arc just below the slots, so that rotation of the pinion will carry the stock around between the curved guides F upon the hinge f `as a center. Figs. 3, 5, and G show this construction. Now, by this feature or part oi' my inirprovement the head is adjusted with ease and 'any desired degree of exactness, so that the tool is under complete control of the workman, and can be set to any position between horizontal and vertical without changing the work on the table. i

1 The other part or feature ofmy improvement is a means for controlling the belt that drives spindle c. Such means or device is required to `keep the belt on the pulley c in all positions of the head. For this purpose I fix to one side of the bed A a bracket, m, having on the end a swinging box, I, in which is set the ilo wermost rod orbar, It, of a rectangular frame, K K. This lowermost rod is free to slide through the box, but is held at any required point by 'a set-screw, on. rl`he sides K Kof hinge at the `front, so that it can be set to prethis frame are two sets of arms or iiat bars,

the upper two of which are swiveled at their middle to the top ends of the lower two, at the point where the second or intermediate shaft, k, connects the tops of the lower arms. A shaft, k2, connects the upper ends of the swivels sides Ktogether, and by means of a clamp -nut and bolt, n, working through a curved slot, p, in the side of thearm or bar K, the lowei1 end of each bar K is secured to the lower bar. The top and intermediate shafts carry pulleys L L, the upper one of which, being in the jointed half of the frame, can be thrown in or out to act as a tightenerpulley. This belt-controlling frame then swings on the point K as a center, and is also capable of being shifted laterally to bring the pulleys L L into line with any particular one of the conepulleys C. The pulleys L aretherefore always set 'to be in the same plane with the Working-pulley on the spindle c, so that the belt is held in line with it and kept in place and at proper tension.

By the arrangement of belt-tightening mechanism shown I can tighten the belt going to or coming from the head separately or together. Suppose, for example, that the belt is'coming in direction shown by arrow, Fig. l, and that the upper and lower pulleys are I rigidly connected by nut and bolt n, by inclining the frame in one direction or the other, and fixing it there, the belt both coming and going will be loosened or tightened, according to direction of inclination. Then by loosenand tightened. As the belt is put upon one or the other step on the head the frame bearing the pulleys can be moved back and forth through bearing Z tojbring the pulleys in line with the step being'used.

Figsfl, 2, and 4 ofthe drawings illustrate the construction and application of this belt-controlling frame'. c

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. The combination, with theslide, of the stock pivoted or hinged at the front to the slide, the slotted arcs F F, and the studs g2, and means, substantially as described, arranged relatively to the spindlepulleys,'foi` holding the driving-belt in working position on any particular pulley of the cone.

2. The combination, with the horizontallyadjustable slide E, of thestock D, pivoted or hinged thereto at the front, the slotted arcs F F, springing from the back of the slide, the

stud connected with the stock and working through the curved slots, and a means, as the curved racks h and the pinions on the shaft g', for moving and setting the stock D, substantially as described.

3. The combination, with the swinging stock, of the swinging belt-controlling frame K 7c L, having a lateral adjustment to bring the pulleys in line with any particular one of the cone-pulleys of the stock-spindle, and having a swinging movement corresponding to the movement of the stock, substantially as described.

ALBERR SCHURCH. [n s] Witnesses:

EDWARD E. OsBoRN, F. M. DOWNEY. 

